Door stop



FIG. 1 is an end view of a door stop, showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is an end view opposite to that shown in FIG. 1;

FIG. 4 is a side elevational view thereof, taken in the direction opposite that of FIG. 2; and

FIG. 5 is a perspective view thereof. 

The ornamental design for a door stop, as shown and described. 